Error in UselessSetterCall cop

[doy]

Given the file:

def foo(bar)
  begin
  rescue StandardError => _
  end
  bar[:baz] = true
end

I get this output from rubocop -d rubocop_error.rb:

An error occurred while Lint/UselessSetterCall cop was inspecting /home/jesse-luehrs/rubocop_error.rb.

1 error occurred:
An error occurred while Lint/UselessSetterCall cop was inspecting /home/jesse-luehrs/rubocop_error.rb.
Errors are usually caused by RuboCop bugs.
Please, report your problems to RuboCop's issue tracker.
Mention the following information in the issue report:
0.28.0 (using Parser 2.2.0.2, running on ruby 2.1.5 x86_64-linux)
Inspecting 1 file
Scanning /home/jesse-luehrs/rubocop_error.rb
For /home/jesse-luehrs: configuration from /home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/config/default.yml
Inheriting configuration from /home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/config/enabled.yml
Inheriting configuration from /home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/config/disabled.yml
undefined method `type' for nil:NilClass
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:139:in `process_assignment'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:83:in `block in contain_local_object?'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:92:in `block in scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:91:in `catch'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:91:in `scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:95:in `block (2 levels) in scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/astrolabe-1.3.0/lib/astrolabe/node.rb:141:in `block in each_child_node'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/astrolabe-1.3.0/lib/astrolabe/node.rb:139:in `each'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/astrolabe-1.3.0/lib/astrolabe/node.rb:139:in `each_child_node'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:94:in `block in scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:91:in `catch'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:91:in `scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:95:in `block (2 levels) in scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/astrolabe-1.3.0/lib/astrolabe/node.rb:141:in `block in each_child_node'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/astrolabe-1.3.0/lib/astrolabe/node.rb:139:in `each'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/astrolabe-1.3.0/lib/astrolabe/node.rb:139:in `each_child_node'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:94:in `block in scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:91:in `catch'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:91:in `scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:95:in `block (2 levels) in scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/astrolabe-1.3.0/lib/astrolabe/node.rb:141:in `block in each_child_node'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/astrolabe-1.3.0/lib/astrolabe/node.rb:139:in `each'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/astrolabe-1.3.0/lib/astrolabe/node.rb:139:in `each_child_node'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:94:in `block in scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:91:in `catch'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:91:in `scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:95:in `block (2 levels) in scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/astrolabe-1.3.0/lib/astrolabe/node.rb:141:in `block in each_child_node'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/astrolabe-1.3.0/lib/astrolabe/node.rb:139:in `each'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/astrolabe-1.3.0/lib/astrolabe/node.rb:139:in `each_child_node'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:94:in `block in scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:91:in `catch'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:91:in `scan'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:73:in `contain_local_object?'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/lint/useless_setter_call.rb:46:in `on_method_def'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/mixin/on_method_def.rb:9:in `on_def'
(eval):5:in `block (2 levels) in on_def'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/commissioner.rb:92:in `with_cop_error_handling'
(eval):4:in `block in on_def'
(eval):2:in `each'
(eval):2:in `on_def'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/ast-1.1.0/lib/ast/processor.rb:239:in `process'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/commissioner.rb:52:in `investigate'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cop/team.rb:33:in `inspect_file'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/runner.rb:92:in `inspect_file'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/runner.rb:76:in `block in do_inspection_loop'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/runner.rb:71:in `loop'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/runner.rb:71:in `do_inspection_loop'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/runner.rb:58:in `process_file'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/runner.rb:27:in `block in run'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/runner.rb:25:in `each'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/runner.rb:25:in `run'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/lib/rubocop/cli.rb:24:in `run'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/bin/rubocop:13:in `block in <top (required)>'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/2.1.0/benchmark.rb:294:in `realtime'
/home/jesse-luehrs/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rubocop-0.28.0/bin/rubocop:12:in `<top (required)>'
/home/jesse-luehrs/.rbenv/versions/2.1/bin/rubocop:23:in `load'
/home/jesse-luehrs/.rbenv/versions/2.1/bin/rubocop:23:in `<main>'
W

Offenses:

rubocop_error.rb:3:3: W: Lint/HandleExceptions: Do not suppress exceptions.
  rescue StandardError => _
  ^^^^^^^^^^^^^^^^^^^^^^^^^
rubocop_error.rb:3:3: C: Style/IndentationWidth: Use 2 (not 0) spaces for indentation.
  rescue StandardError => _


1 file inspected, 2 offenses detected
Finished in 0.017217432 seconds

This seems possibly related to #1026.